Belt-tightener for sawmill feed mechanisms.



No. 850,698. VBATENTED APR.16, 1907.

, v N. H. WARNOOK. BELT TIGHTENER FOR SAWMILL FEED MECHANISMS.

APPLICATION FILED NOV.B1906.

i [W I M l 1 H i E S 3 2a .12 g 24 HI: J! 6' l i n M I 16 I I F,,,P/ I i 1/ 5- a L i l l'. I

' once is hard to the accompanying drawings,

'respondin rrnn srerns serene? onion.

NICHOLAS HOWARD WARNOGK, OF A snronn, ALABAMA.

BEl.."l'--'l 'l.-thi l-EhlEf-l FUR SAWMILL FEED MECHANISMS;

orfroru the saw, as the case may be end the object thereof is to provide such mechanism l With a rocking frame carrying idler-pulleys which are adapted to alternately engage the belts to move them into driving engagen'ient with a shifting mechanism for the carriage.

Further objects of the invention consist in providing sawmill feed mechanism which shall be simple in its construction, strong, durable, eflicicnt in its use, conveniently opemted, readily set up with relation to the carriage and saw, and comparatively inexpensive to manufacture.

With the foregoing and other objects in View the invention consists of the novel construction, combination, and arrangement of parts hereinafter more speciicelly described, and illustrated in the accompanying drawings, wherein is shown the preferred embcdh ment of the invention; but it is to be understood that changes, vsriutions, and modifica- .tions can be resorted to which come Within the scope of the claim hereunto vappended.

In describing the invention in detail refer- Wherein like reference characters denote corpurts throughout the several Views, on in Wl1ich-- Figure l. is a top plan view of n sawmill feed mechanism in accordance with this in)- vention. Fig, 2 is a sectional side elevation. Fi 3 is a detail showing the rocking frame.

I eferring to the drawings by reference characters, 1 denotes a, base in whit-his jour nsled a saw-arbor 2, can ing a driven pulley 3 therefor, and 4 denotes a saw suitably so cured to the arbor. Upon. the sew-arbor 2 are the flanged pulleys 5 and 6, the letter being of greater diameter than the former. Journuled in the base 1 is e drive-shaft 7 for l the log-corriege (N ot shown.) The shalt 7 carries a, pinion 8, which engages with the ordinary rack (not shown) of c log-carriage for driving the same.

Specification of Letters Patent.

Application filed November 8,

heed Mechanism, of which. the

the pulley 10 is operated.

Patented April s, 1907. 1906. Seriul No. 842,537.

ted to be rotated i1 en rotated to feed the The shaft 7 is ads either direction; but W carriage to the saw the speed of the shaft 7 is less than the speed thereof when it is rotated to shaft the carriage from the saw. the shift 7 suitable distances apart is a pair of flanged pulleys 9 10. The former when operated is adapted to rotate the shaft 7 so as to shift the carriage toward the the reverse action of the shaft 7 v The pulleys 9 10 are of the same (lia-1uetcr,'but the pulley 9 is of larger diameter than the pulley 5, the pulley. 9 being driven from the pulley 5 in a n'iunncr' as hereinafter set forth. The pulley 10 is of larger diameter than the pulley 6 and is driven from said pulleyin a manner as here? inclter set forth.

The reference character 11 denotes a belt saw, and

is had when Fixed to 1 which is adapted. to intermittently engage the pulley 9 and operate it, and in this connection it will. be stuted that the belt 1 1 travels over the pulley 5 and also over an idler-pulley 1,2, which carried by a shaft 13, journcled in the base 1. The belt 11 is adapted to be engaged by a shilteble flanged belttightencr pulley 14, so as to draw the belt tsut and cause it to operetively engage with the pulley 9 so as to drive it. The manner in which the idler-pulley 14 is shifted so as to pull the belt 1i [out will presently be expleined. The pulley .H) is operated through the medium of a belt 15, which passes over the, pulley 6 and also over the pulley 10; but normally this belt loosely psssesover the said pulleys. The belt 15 is drawn taut through the medium of u shiftable flanged belt-tightener pulley- Ilfi, so as to cause a driving of the pulley 1U from the pulley 6. ll henthe pulley 10 is driven, it will cause the rotation of the shaft 7 and shift the carriage from the saw. T he shaft "7 when driven by the pulley 10 rotates at :1 grcutcnruie of speed than when driven by the pulley 9. The letter when operating the shaft shifts the carriage to the saw. The manner in which the idler-pulley 16 is shifted to draw the bolt 15 taut will presently be referred to.

Loosely mounted upon the shaft 7 is a rocking frmne formed of three members 17. 18, and ll), the member ltl'being the intermodiute-member and of approximately double the length of either of the members 17 and ill. The member 18, centrally thereof, is provided with an opening, so that the some can brmounted upon the shaft 7, while the rear end-of the member 17 and the forward end of the member 19 are provided with openings in alinement with the opening'in.

three members of the frame canbe loosely mounted upon the shaft 7L Thel forwardends of the member 17 and the member "18'.

- and 0116 which is of greater,diameterthan the other, a driven shaft, a'pair of ulleys are rigidly connected together by the-1101C fast device 20 in the form of a bolt and nut, and such bolt. constitutes a shaft for the idler-pulley 16. Suitable collars 21 are provided upon the bolt, so as to prevent the lateral movement of the idlerulley 16 upon the bolt. The rear 'ends of t 0 members 18 and 19 are rigidly connected together by a holdfast device 22 in'the form 0 a bolt and are provided upon the bolt to revent the lateral movement of the idler-pu ley 14. I

The rocking frame is shifted through the medium of a pair of inclined links 24, which at. their forward ends are attached to the members 17 and 1-8 byleg'screws 24*and at their rear ends are connected, as at 25, to an operating-lever 26, pivoted at its lower end, as at 27, to the base 1.

If'the lever 26 is shifted forwardly, it will lower the forward end of the frame so as to bring the idler-pulley 16 into engagement with the belt and cause the belt to oper-' atively on age the pulleys 6 and 10. Consequently t e pulley 10 will be driven and cause the rotating of the shaft 7 which will shift the feed-carriage from the saw. After the carriage has been moved from the saw the desired extent then if the lever 26 be shifted rearwardly it will rock the frame so as to lower the rear end thereof and, bring the idler 14 into engagement with the belt 11, consequently drawing the said belt 11 taut. and cause it to operatively engage the ulley 9, thereby driving it and rotating the s aft? in a direction opposite to that in which it' is rotated by the pulley 10 and cause the shiftin of the carriage toward the saw.

I %t will be evident from the fore oing de scription, taken in connection Wit the accom anying drawings, that a sawmill feed mec amsm is set up which is extremely simlinks for actuatin In testimony w ereof I have hereunto set my hand in presence of tw nesses.

ple in its construction and positive in its operatiomand it is thought t e advantages of such construction can be generally under the center of the member 18,, softhat' the stood,

vWhat l claimiis I v I A feed mechanism comprising a drive-shaft,

a pair of ulleys mounted upon said shaft said driven shaft, a pair of arms pivoted at one end upon saiddriven shaft, extending in.

opposite directions with respect to each other and eachof which. is of less'length than the rocking, arm, connections between the free end of one of said short arms and one end of said rocking arm, an idlenp'ulley carried by said connections and ada ted to be moved intoenga ement with the lt,11 and'draw it taut w en said rockingarm is shifted in one direction causing thereby the operation of one of the pulleys uponsaid driven shaft and the operation of said latter shaft, con nections between theiree end of the other of said short arms and the other end of said rocking arm, an idler-pulley mounted" upon the last-mentioned connection and adapted when the rocking arm is shifted in the opposite direction to draw the belt 15 taut thereby causing the. operation of the other of the pulleys upon the driven shaft, and the reversal of movement of said latter shaft, a pair of inclined links connected with one end of said rocking arm and with one end of one of the short arms, an}? a lever pivoted to said t em.

cribing wit- NIGHOLAS HOWARD WARNOCKN Witnesses:

W. R. WA'rFoRn, RoBT. Born. 

